The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 1982
Filed:
Jun. 05, 1980
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A device for detecting engine knock is disclosed. The device comprises a bipolar vibration sensor secured to a spark ignition internal combustion engine and has first and second outputs for generating respectively signals representing individual ringing engine vibrations due to engine knock and signals representing the background engine vibrations due to engine operation, separately. A smoothing circuit is connected to the second output side of the vibration sensor for forming a means value of the background engine vibration signals. A comparator circuit has a first input terminal connected to the first output side of the vibration sensor and a second input terminal connected to the output side of the smoothing circuit for comparing the mean value of the outputs of the smoothing circuit with the peak value of the ringing engine vibration signals. A utilization circuit is connected to the output side of the comparator circuit for controlling the driving condition of the engine in an optimum manner. The bipolar vibration sensor comprises a first vibration section having a resonance frequency corresponding to the ringing vibration frequency due to engine knock and second vibration section having a resonance frequency different from the ringing vibration frequency.